Percent and Algebra

Percent Triangle

100

15% of 45

6.75

200

Bag of marbles contains 5 red, 6 bue and 3 green.  

What percentage are blue?

42,86%

300

Ms. Lee got 30% discount, and she paid 140 kr for a shirt. How much did it cost before the discount? 

200kr

400

70% of 240 is p. 80% of q is 240. Calculate 10p/q

5,6

500

Mr. Olsen put 5000kr in the bank. The bank pays interest of 11%. How much has he after 3 years? 

6838kr

Percent Change

100

Decrease 45 by 10%

40,5%

200

A persons salary changes from $2 400 a month to $3 000 a month. What is the percent change?

25%

300

You own 45 books.  If you donated 12 books to charity.  By what percent has your number of books changed?

26,67%

400

The length of a rectangle increases by 10% and the width decreases by 10%. what percent does the are of the rectangle has been changed? 

reduced 1%

500

The price of flowers is increased by 50%. By what percentage must the price thereafter be reduced in order that the final price be the same as the original price?

Around 33,3%

AlgebraExpressions

100

Evaluate 12-2x, if x=4

4

200

One side of a rectangle is 32cm shorter than the other side. Write the expression for the perimeter of the rectangle.

2x-32

300

One side of a rectangle is 32cm shorter than the other side. if the perimeter is 540cm.What is the length and width of the rectangle?

286, 254

400

Simplify 2x(x-3) - 5(x²+4x)

-3x²-26x

500

Simplify (3x+1)(4x-2) 

12x²-2x-2

Algebra Equations

100

Solve this equation 2x -1=5

x=3

200

Rajmina and Anya earns together 31500 kr every month. Rajmina earns 750kr more than Anja. How much does Rajmina earn?

15375kr

300

Solve 4(x-8) = 2(x+3)

x=19

400

Oscar says ' 4 times my number minus 8 is the same as 2 times my number plus 2.' Set up an equation and calculate which number Oscar is thinking about. 

5

500

Solve the simultaneous equation

2y+x=5

3y-x=0

x=1, y=2